Results 1 to 6 of 6

Math Help - maths - roots of equation

  1. #1
    Member
    Joined
    Aug 2009
    Posts
    96

    maths - roots of equation

    for what valus of k does x^2 + (k+2)x + (k+2) = 0 have equal roots??
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,234
    Thanks
    27
    Quote Originally Posted by deej813 View Post
    for what valus of k does x^2 + (k+2)x + (k+2) = 0 have equal roots??

    It has repeated roots at (k+2)^2-4(k+2)=0
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Aug 2009
    Posts
    96
    um ok
    can you explain how?
    so what values of k??
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
    Joined
    Feb 2008
    From
    Yuma, AZ, USA
    Posts
    3,764
    Thanks
    78
    Quote Originally Posted by deej813 View Post
    um ok
    can you explain how?
    so what values of k??
    It will have repeate roots when the discriminat is equal to zero.

    The discrimiant is the b^2-4ac part of the quadratic equation(the stuff under the radical)

    Solve the above equation to get the "two" values for k (pun intended)
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Member
    Joined
    Aug 2009
    Posts
    96
    so its when k is + or - 2
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Dec 2009
    From
    Lima OH
    Posts
    11

    roots

    You are correct. There will be two parabolas with one root each. Each parabola has a vertex touching the x-axis.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 5
    Last Post: December 28th 2010, 12:22 AM
  2. Maths help with equation of line and algebra?
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: February 1st 2009, 08:44 AM
  3. Replies: 1
    Last Post: January 19th 2009, 02:44 AM
  4. further maths quadratics and roots again
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 29th 2008, 02:36 PM
  5. further maths roots of equations
    Posted in the Algebra Forum
    Replies: 3
    Last Post: September 29th 2008, 11:22 AM

Search Tags


/mathhelpforum @mathhelpforum